No. and what does it matter if they do? Saying I accept bitcoins is easy, now getting people to spend them with you is another story all together.
As these sites realize that no one is spending btc they will just do away with it or move to other alt. currencies.
Who says nobody is spending?
Yesterday I bought a "rare" copy of Final Fantasy 7 from a friend, and was going to buy some ecigerettes but the vendor's website wasn't functional. I think Sublime is projecting.